Dating post slide rules
As the ISRM curator, I have focused on logarithmic based calculating devices, also fondly known as slide rules, over the past 10 years, and have basically ignored other historic 'mechanical' calculators and methods.This was mostly because of lack of time and resources, but as I have come to learn about, and appreciate, the manufacturing art and long history of abaci in various cultures."The scholar Mori Shigeyoshi [early to mid 17th century] who flourished in this period is Japan's first 'mathematician'.He is, according to legend, supposed to have traveled to China and returned with a knowledge of Chinese mathematical achievements and the suan-pan, a Chinese abacus. The suan-pan was probably introduced to Japan much earlier.
like they’re entitled to them and their partner is cruelly withholding it.I was also surprised, when I started receiving these, at how small most are.The modern era (Showa) sorobans are approximately the same size as slide rules making them very portable, even for the pocket.As I acquired artifacts for the gallery, I was puzzled with many Japanese sorobans had upwards of 21 digits, or columns of beads.After all, the United States national debt is in the trillions which is 10 and only needs 14 digits, counting two decimal points, to display.